Intercritical Annealing of 22MnB5 for Hot Forming Die Quenching

International Deep Drawing Research Group 37th Annual Conference

Yan, Haotian^1 ; Ciano, Massimo Di^1 ; Verma, Mohit^1 ; Daun, Kyle J.^1

University of Waterloo, 200 University Avenue West, Waterloo

ON

N2L 3G1, Canada^1

关键词: Austenite phase;    Austenitization;    Intercritical annealing;    Muffle furnaces;    Soak temperature;    Ultra high strength steel;    Vickers hardness measurements;    Water-quenched;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/418/1/012010/pdf
DOI  :  10.1088/1757-899X/418/1/012010

来源: IOP

【 摘 要 】

Austenitization models for ultrahigh strength steels like 22MnB5 are needed to: optimize existing furnace-based processes for hot forming die quenching (HFDQ); explore the potential of intercritical annealing to obtain softer, more ductile parts; and develop new HFDQ technologies such as direct-contact heating. This paper evaluates three such models using austenite phase fractions derived from Vickers hardness measurements made on Al-Si coated 22MnB5 coupons heated within lab-scale muffle furnace and then water-quenched. Overall, predicted trends are in good agreement with the experimental results at different soak temperatures, but experimental trends with increasing soak times are less obvious. The experimental results also highlight a deficiency in a recently-proposed physics based austenitization model at higher soak temperatures.